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(11) | EP 4 477 993 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | RETROGRAPHIC SENSORS |
| (57) A retrographic sensor comprising: a substrate formed of a pliable material having
a first hardness, the substrate capable of optically transmitting an image therethrough;
a deformable layer disposed on the substrate, the deformable layer including a first
surface adjacent to the substrate and a second surface opposing the first surface,
wherein the deformable layer is formed of a material that reflects light passing through
the substrate and incident on the first surface; and a plurality of particles, wherein:
the plurality of particles are embedded in the deformable layer, the plurality of
particles have a second hardness greater than the first hardness of the pliable material
of the substrate, the plurality of particles form a plurality of non-planar protrusions
from the second surface, and a pattern of the non-planar protrusions forms interstitial
channels that permit a flow of air between the non-planar protrusions on the second
surface of the deformable layer.
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